Oil well pump for oil field

Abstract

The invention relates to the technical field of oil field exploitation, and discloses an oil well pump for an oil field. The oil well pump comprises an oil well, a pump cylinder and an oil inlet cavity, wherein the pump cylinder is fixedly sleeved with the oil well; and the top end of the oil inlet cavity is fixedly connected with the bottom end of the pump cylinder. Through arrangement of a spiral scraper, crude oil adhered to the inner wall of the pump cylinder is removed below a plunger, so that the thickness of the adhered crude oil is reduced, an oil film is better formed, sand grains inthe crude oil adhered to the inner wall of the pump cylinder are reduced, the accumulation of the sand grains between the plunger and the pump cylinder is reduced, plunger wear is reduced, and the service life of the oil well pump is prolonged. Meanwhile, through arrangement of a center shaft and a cross rod, the spiral scraper rotates under the upward impact of the crude oil along with descendingof the plunger, and then a middle sealing ball is driven to rotate, so that the crude oil forms rotational flow to be conveyed upwards, resistance to the plunger is reduced, the conveying rate is increased, direct impact with the middle sealing ball is reduced, and the conveying rate of the crude oil is further increased.

Description

Technical field [0001] Technical Field The present invention relates to oil exploration, particularly for oil field as a pump. Background technique [0002] A common pump on the oil pumped to the surface of the well pumping equipment, such as attachment Figure 8 As shown in which way the pumping of crude oil by lifting up and down movement of the plunger 5 from the lower to the height and the oil pumped from the outer bottom uphole output well, when the piston 5 upwards, its lower portion forming the negative pressure, the sealing ball 7 and the sealing ball 6 is closed, the sealing ball 4 is pulled up, so that the crude oil into the cylinder 2 from the pump into the oil chamber 3, while the upper portion of crude oil lifting piston 5, when the plunger 5 downward, the sealing ball 4 is closed, the sealing ball 7 and the ball 6 on the opening seal, with the decline of the piston 5, the piston 5 into the lower portion of the piston 5 in the oil gradually, thereby forming cycle, to ...

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Problems solved by technology

[0003] Usually, the bottom end of the plunger 5 is provided with a taper of about 1:100, in order to make the plunger 5 easy to fit into the pump barrel 2 which has strict matching requirements with it. Crude oil will adhere to the inner wall of the pump barrel 2, and the crude oil contains sand particles. As the plunger 5 descends, the sand particles will accumulate and block between the pump barrel 2 and the plunger 5. After long-term accumulation, the oil pump plunger will be blocked Although some oil well pumps have a sunken right-angle sand collecting groove on the outer wall of the plunger 5 to slow down the blockage of the oil well pump by sand particles, it is still unsatisfactory. Or block the oil pump and stop working, causing the oil pump to freeze

[0004] When the plunger 5 is upward, the space below the plunger 5 creates a negative pressure zone, which attracts the crude oil in the oil well below the oil chamber 3, and the crude oil pushes the lower sealing ball 4 to enter the negative pressure zone, but at the same time, the negative pressure zone passes through the column. The gap between the plug 5 and the pump cylinder 2 makes the liquid in the cylinder above the lifted plunger 5 seep back to the lower part of the plunger 5, and the seeped liquid passes through the gap between the plunger and the pump tube under high pressure to generate atomization and fill up rapidly. The negative pressure zone at the lower part of the plunger 5 forms an air resistance wall and occupies the space of the negative pressure zone, which reduces the efficiency of the oil well pump and affects the production of the oil field

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